New: Can remove attached files before sending emails

htdocs/admin/mails.php

htdocs/comm/mailing/fiche.php

htdocs/comm/propal.php

htdocs/commande/fiche.php

htdocs/compta/facture.php

htdocs/html.formmail.class.php

htdocs/langs/en_US/other.lang

htdocs/langs/fr_FR/other.lang

htdocs/lib/functions.lib.php